Production of phonographic sound-records.



PATENTED APR. 23, 1907.

w. P. NEHR. PRODUCTION OF PHONOGRAEHIG SOUND RECORDS.

APPLIOAI'ION FILED JULY 3, 1906.

graphic sound-records.

ed certain new and I UNITED STATES WILLIAM F; NEHR, OF was'r oaii I JERSEY PATENT COMPANY, or RATION OF NEW JERSEY. 1

PATENT OFFICE.

NGE, NEW JERSEY, AEiSIGNOR TO NEW WEST ORANGE, NEW JERSEY, A CORPO:

PRODUCTION oF P'HoNoeFmPHlo SOUND-RECORDS- My invention relates phonographlc sound-records, and more partlcularlyto' a molding process described and claimed in-Unit ed States Letters Patent No.

683,615, dated October 1, 1901, to Miller and Aylsworth, wherein a tubular mold is caused to descend into a bath of molten material, 1 which fills the same and eongeals upon its interior in a coatin or layer which adheres to the same while. t 1e mold is lifted-out of the bath, after which the record u'lponits interior surface and removed from emold by' radial contraction or shrinkage.

-Heretofore inprodueing records according to this process it has not been the upperend of the record I sired in the finished article,

possible tomold to the shape dethe practice he ing tolformarough end, which must after- 'scription.

suitable manner, as

ward be removed-pin an v of any suitable doby a'cutter or. trimmerhas for its object the rovi ay be molded int'o'a form suitable for the finished articlethat is, a surface whichwill present a smooth and polished appearance and which will be free from depressions, elevations, discolo'r ations, and all forms of roughness or in-egularity. With this end in view I have made a large number of experiments to obtain a mold-cap which. when placed upona tubular eoreless mold will be My invention v sion of' a process whereby such upper enr capable of molding the upper end of the these ex sound-record in the manner referred to for .anindefinite number of operations. From eriments Ihave determined that the mol -cap should havea concave surface, the outer edge of which during molding 0 eration adjoins and forms a continuation o the bore of the mold. Preferably the body of the mold'should extend above 'at least the Specification of Letters Patent. Original application filed September 9, 1905, Serial No. 277,800. Divi to the melding of may be finished Patented April-23, 1907. dad and thisapplication filed July 3, 1906. Serial No. 324,552.

lower part of said concave surface, so that when. the cap removed from the mold the .molded end of the record, or that portion which. forms the end after the reaming, operation, will be protected. by the mold against accidental injury during the handling of the same prior to the removal of the finished articie from the mold. l have also determined that the saidconcave surface may be of such lf'orm to entrap a ort-ion of the air contained in the bore oft irmold as the same de- 'scends into the molten material, in which case the air is ermitted to est-ape. through air-holes exten ing through the body of the mold cap. I have also obtained good results by?providing a second groove concen- I trio with the first groove and separated there from by a partition which tapers to a cou1- paratively sharp edge. I have aiso dis covered that the concave surface should be perfectly smooth and highly polished and preferably nickel-plated an also that the mold-cap should be kept cool during the molding operation, as by providing thesame "with a Water-jacket.

My invention consists in the features hereinafter described and claimed.

. Reference is hereby made tothe accompanying drawing, which-is a vertical section showing a mold supported in amohl-carricr and surroiin'ded' by a Water-jacket in the usual manner and provided with a cap constructed in accordance with my invention.

In carrying out the )roceslftgofPatent vNo. 683,615,above referred to, the usual practice is to provide a tubular mold' 1, carrying upon its-interior surface a negative sound-record which it is desired to duplicate. the molten material used for duplicate to enter-the mold, the mold being supported by a suitable carrier or support 2, which is provided with a seat 3 end of the mold and an opening 4' to allow the molten material to enter the mold. A. removable water-jacket 5- surrounds the mold in order to keep the same at a tem rature considerably below that of the mo ten mixture.- The ing broadly, are well known in this art and form no part ular form of mold. lust'rated is believe to be for the lowerof'm invention. The partiesparts thus described, speakgrooves 7 and 8 are separated by a Web or tively sharp and occupies untarnished surface.

novel, however, and is described and claimed in an application of Edward L. Aiken, filed October 12, 1905, Serial No. 282,365.

' The mold-ca 6 consists of a circular bod of a size suitab e to fit within the u per endhe lower partition 11, whose lower edge is comparesame horizontalplane as the outer e ge ,of

the groove 7 and inner edge of the groove 8.. The cap 6 may be constructed of any suitable metal pr alloyfisuch as brass, and its entire lower-surface is highly polished and nickelplated, so as to present at all times a bright I The cap 6 is provided with a curved rod 12, by which it may be conveniently handled.

The cap 6 is also provided with a waterjacket I3, preferably integral therewith, and is supplied with water through a flexible tube i 16 and an inlet-pipe 14, the water leaving the jacket through an exit-pipe 15 and flexible tube17. I

In molding a record with the apparatus shown the temperature ofv the wax and the duration of'inimersion of the" mold will be such that the mold will receive u on its interior surface a coating of congea ed wax 18.. Upon removing -'the mold fromthe bath of molten. material the said coating-adhere s to the mold, and as soon as thewax has cooled sufiiciently the cap 6 may be regaiived-by a longitudinal movement and the neck 19 of the molded'articlemay bit-removed by givi ,it a slight twist, whereupon it breaks 0 generally at or near the point 20. The interior of the record is then reamed outv by a properly-shaped knife while the wax' is-gstill soft, so that'its interior surface assumes "the stages of manufacture.

stantiall the shape indicated by dotted lines 21. It will be noted that the line 21 falls just outside of the groove 9 and air-holeslO, so that any impressionflvhich may have been produced by these parts will not appear upon the finislied article. Furthermore, that portion'of the congealed wax from which the record is formed is entirely within the bod of the mold, so as to be protected there y at .all

After the reaming operation the record may be removed from the mold in an entirely finished condition by cooling, thereby producing a relative contraction of the record with respect to the mold and then With16 5 drawing the record from the mold by a longitudinal movement. Having now described In invention, what I claim as, new therein, an desire to secure by Letters Patent, is as follows: 7o 1. The process of molding which consistsin causing the molten material to rise and c'ongeal in a layer upon the interior of a hollow coreless mold, entrap ing the air nearest the Wallof the moldand a lowing it to esca e through an airassage, removing the mo (1 with its congea ed layer from the molten. material and then reaming out the bore of said layer-while soft, on a line falling-without the position of the airpassage, substantially as set forth.

2. The process of molding which. consists in causing the molten material to rise and congeal upon the interior of a tubular cor'eles's mold, having an overhanging concave sur face forming a'continuation of the bore-of-the mold, removing the mold with its congealed "layer from the molten material and then, reaming gout the-bore of the layer'while soft i on. a line which intersects the position of said c concave surface at a points1tuated-within.' the body-of the mold, substantially as set forth. v This specification signed and; witnessed" day ofJune,1906.

' WILLIAMJF. .VVitnesses: i i

' DELOS HOLDEN, FaANK D na. 

